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16 Cards in this Set
- Front
- Back
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Element |
Substance whose atoms have the same atomic number |
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Atom |
Smallest particle of an element. Atoms have a nucleus containing protons and neutrons, surrounded by shells which contain electrons. |
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Molecule |
Particle consisting of two or more non metal atoms chemically bonded together by covalent bonds. |
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Bonds |
Attractive forces between two particles |
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Atomic radius |
Half the diameter of an atom |
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Bond length |
Distance between the centres of two atoms that are chemically joined together |
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Subatomic particles |
Particles from which atoms are made, including protons, neutrons anf electrons |
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Nucleus |
Positively charged centre of an atom which contains protons and neutrons |
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Electron |
Subatomic particle surrounded the nucleus of an atom. Has a negative -1 charge and has a very small mass |
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Shell |
Region of space in an atom that can hold a certain amount of electrons. |
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Chemical symbol |
Letter or letters used by a chemist which represents an element. E.g the symbol for mercury is Hg |
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Atomic numbers |
Number of protons in an atom. |
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Mass number |
Number of protons and neutrons in an atoms nucleus |
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Isotopes |
Atoms with the same amount of protons and neutrons, but with different number of neutrons are isotopes of the same element. |
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Ion |
Charges formed when an atom or a group of atoms loses, or gains electrons. |
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Plum pudding model |
Outdated model in which electrons are shown to be embedded in a sphere of positive charge. |
